Previously, I reviewed one of Nihon IR‘s other popular English Language study tools, 出る順. Dr. コーパス is similar in its approach in that it isolates vocabulary and allows students to select from different review methods. Both apps are geared for English study, but as I hope to show, are excellent tools for learning Japanese. While this review will be short, it will focus on how and/or if Nihon IR have managed to create a good study formula.